Hand pump



July 19, 1966 c. F. PARROTT HAND PUMP Filed April 15, 1964 aw i imwv (w T 7 Q 9 mm ks. I mm wwxi M Q V d n r 18/ 3 $3 NM mm. W AR, QKMRK M 2 R a k G mm \.L 3

I/VVEIVTOR CLARENCE f7 PARROTT 6 0 (AW ATTORNEY United States Patent 3,261,299 HAND PUMP Clarence F. Parrott, Parco Products Co., Pottstowu Ave., Pennsburg, Pa. Filed Apr. 15, 1964, Ser. No. 359,926 4 Claims. (Cl. 103188) This invention relates to hand pumps and more particularly to pumps of portable character for use with tanks, including back carried tanks, for fire fighting and for the dispensing of insecticides, plant fod and the like.

In my prior application for Letters Patent filed October 15, 1962, Serial No. 230,458, now US. Patent No. 3,- 131,646 there is disclosed a hand pump of improved type which includes telescoping elements with the valves at the opposite ends thereof and readily accessible for inspection and replacement if necessary.

While this pump has proven to be very satisfactory under certain operating conditions air may be drawn in or be trapped and this reduces the effectiveness of the pumping action and may require repri-ming.

, In acordance with the present invention apparatus is provided for improving the effectiveness of the pump of my prior application as well as other pumps.

It is the principal object of the present invention to provide a hand pump which is simple in construction, which can be readily assembled and disassembled as desired, which is reliable in operation, and which is particularly free from any tendency to draw in or trap air in the interior thereof.

It is a further object of the present invention to provide a hand pump, operated by relatively sliding telescoping sections, with which a liquid stream can be made available and directed as desired, and which has an increased suction,

It is a further object of the present invention to provide a hand pump of the sliding or telescoping type having an insert which greatly improves the operation thereof by changing the interior to eliminate air trapping locations.

It is a further object of the present invention to provide a hand pump of the sliding or telescoping type which has an insert therein for improving the operation which is free from any tendency to vibration, which does not tend to break loose in use, which can be readily inspected, if desired, which is readily insertable, which is easily removed for cleaning, which accommodates itself to variations in lengths of cylinders, which does not require soldering for installation, and which has a simple but effective seal.

Other objects and advantageous features of the invention will be apparent from the description and claims.

The nature and characteristic features of the invention Will be more readily understood from the following description taken in connection with the accompanying drawings forming part thereof, in which;

FIGURE 1 is a side elevational view of a hand pump in accordance with the invention;

FIG. 2 is a central longitudinal sectional view of the pump shown in FIG. 1; and

FIG. 3 is a transverse sectional view, taken approximately on the line 33 of FIG. 2.

It should, of course, be understood that the description and drawings herein are illustrative merely, and that various modifications and changes can be made in the 3,261,299 Patented July 19, 1966 structure disclosed without departing from the spirit of the invention.

Referring now more particularly to the drawings a pump of the sliding or telescoping type as shown in my prior application, Serial No. 230,458, now US. Patent No. 3,131,646, illustrated for purposes of illustration and has the improvement of the present invention therein shown. An intake section 10 is provided having an internally threaded bore 11, a coaxial bore 12 extending therefrom to a transverse wall 13, a coaxial bore 14 of smaller diameter than the bore 12 with a frustoconical valve-seat 15 extending therefrom, a coaxial supply bore 16 and an angularly extending feed bore 17 with an intake connector 18 extending therefrom for the connection of a supply pipe 19 which is connected to the liquid source (not shown) and which may be a back carried tank.

An outer cylinder 25 is provided having one end 26 in threaded engagement with the bore 11, and having an end face 27 serving as a stop. The other end 28 of the outer cylinder 25 is threaded for the reception of an internally threaded gland 29, which retains a sleeve guide 30 in position in engagement with an end face 31 of the outer cylinder 25. The gland 29 also serves to compress a gland seal 32 against the guide 30. The outer cylinder 25 has an interior elongated cylindrical surface 33.

An inner cylinder 35 is provided slidable in the sleeve guide 30 and concentric and coaxial with the outer cylinder 25. The inner cylinder 35 has an internally threaded end 36 for the reception of a guide plug 37, which may have a generally hexagonal head with flats 37a and curved connecting faces 37b which slide along the interior surface 33 of the outer cylinder 25. The spaces between the flats 37a and the interior surface 33 permit of fluid flow in both directions past the guide plug 37 during operation. The guide plug 37 has an interior passageway 39.

The inner cylinder 35 has the other end 40 thereof in engagement with and carried by an extension 41 on a valve carrying head or outlet member 42.

The valve head 42 has an interior bore 43 extending to a coaxial frustroconical valve seat 44 from which an enlarged coaxial bore 45 extends to a transverse wall 46, which is at the inner end of an enlarged internally threaded coaxial bore 47.

An outlet section 50, which serves as a closure is provided having a threaded portion 51 for engagement with the bore 47 in abutting relation to the wall 46.

The outlet section 50 has an interior valve receiving bore 52 with a valve postioning wall 53 from which a passageway 54 and bore 55 extend to the outer end for fluid discharge.

The outlet section 50 has an enlarged rim 56 for facilitating turning thereof.

The outlet section 50 has secured to the exterior thereof a hollow tubular hand grip 57 with a rear flared portion 58. The grip 57 extends along and is spaced from the inner cylinder 35 and permits movement of the outer cylinder 25 and gland 29 during relative movement of the outer cylinder 25 and the hand grip 57.

The valve assembly 60, one of which serves as an inlet valve in the intake section 10 and another of which serves as the discharge valve in the valve head 42, has a circular ring 61, end faces 62 and 63, and a central opening 64. The periphery of the ring 61 has an outer cylindrical surface 65 and a cylindrical surface 66 of reduced diameter with a wall '67 therebetween. From the ring 61 at one Q end of the central opening 64, two integral curved bands 68 extend to one side of a valve plug or head 69 of generally hemispherical shape and with a seating surface 70. The valve assemblies 60 can be made of any desired material but are preferably molded from flexible and resilient synthetic plastic.

The valve assembly 66 which serves as the intake valve, shown at the left of FIG. 2, has its ring end face 62 in engagement with the wall 13, has its peripheral surface 65 seated in the bore 12 and has the end 27 of the outer cylinder 25 engaging the Wall 67. The seating surface 70 engages the valve seat 15 and is movable therefrom, upon flexing of the bands 63. This valve assembly 60 by reason of its resilient ring 61 also aids in preventing fluid leakage at the junction of the outer cylinder and the inlet section 10.

The valve assembly (it) which serves as the discharge valve, shown at the right of FIG. 2, has its ring end face 62 in engagement with the wall 46, has its peripheral surface in engagement with the bore 52, has the end face 53 of the outlet section 50 in engagement with its end face 63, and has its seating surface 71 engaging the valve seat 44. The valve head 42 and the outlet section 53 with its bore 55 serve as a fluid delivery section.

The foregoing structure, other than the details of the guide plug 37, is substantially the same as that disclosed in my prior application referred to above.

In accordance with the present invention, a cylinder insert 81? is provided, mounted in the inner cylinder 35. The cylinder insert 80 includes a tubular member preferably a metal tube 81 extending at one end into the bore 43 of the head 52 and at the other end being received in the passageway 39 in the guide plug 37. Spaced inwardly from one end the tube 81 has a rigid plate 82 permanently secured thereto to provide an abutment, a resilient washer 83 engaging thereagainst and against the inner end of the head 42. Spaced inwardly from the other end a rigid plate 84 is permanently secured to the tube 81 to provide an abutment, a resilient washer 85 engaging thereagainst and against the inner end of the guide plug 37. The pressure applied longitudinally by the inner end face of the guide plug 37 on the washer S5 for sealing and through the plate 84, tube 81 and plate 82 on the washer 83 for sealing is determined by the extent of tightening of the guide plug 37.

The mode of operation will now be pointed out.

Assuming that the hose 19 is connected to a supply of liquid, the intake section It) is grasped by the user with one hand, the other hand grasping the hand grip 57. If now the cylinders 25 and 35 are extended, liquid will enter past the head 69 of the inlet valve 60 into the increasing space between the inlet valve 6E? and the guide plug 37. At the same time liquid in the space between the inner and outer cylinders 25 and 35, and the sleeve guide and the guide piug 37 will freely pass the guide plug 37 in the spaces between the flats 37a and the interior surface 33 of the outer cylinder 25. The head 6% of the outlet valve 60 will remain seated.

If now the hand grip 57 is moved towards the intake section 10, the head 69 of the inlet valve 6%} will remain seated. The decrease of volume within the outer cylinder 25 will cause liquid to pass through the interior passageway 3, into and through the tube 81, through the bore 43, past the head 69 of the outlet valve 60 which is forced open, through the central opening 64, the passageway 54 and the bore 55 for delivery as desired.

Repeated reciprocation or telescoping and extending the cylinders 25 and will effect the delivery of additional liquid through the bore 55.

The use of the tube 81 eliminates any space within the inner cylinder 35 within which air can be trapped which air might tend to break the priming if the pump is operated at a great inclination. The use of the tubeSl also increases the suction.

The mounting of the tube 81 between the resilientwashers 83 and 85 eliminates any tendency to leakage with respect to the space between the tube 31 and the inner cylinder 35, and also eliminates vibration of the tube 81 and noise during operation. The resilience of the washers 83 and 85 accommodates variations in linear dimensions of the internal space although thicker or thinner washers can also be employed for accommodation.

Access to the inlet valve assembly 60 for inspection or replacement can be had quickly and easily by unscrewing the threaded end 26 of the outer cylinder 25 from the bore 11 of the intake section 10. The old valve assembly [can be removed, a new valve assembly 63 inserted, and cylinder 25 retightened to hold the valve assembly in place and provide a seal.

Access to the outlet valve assembly 60 for inspection or replacement can be had quickly and easily by unscrewing the outlet section 50 from its engagement with the threaded bore 47. The old valve assembly 60 can be removed and a new valve 60 inserted. The outlet section 5t} can again be engaged and retightened to hold the outlet valve assembly 60 in place and provide a seal.

Access to the tube 81 and to the washers 83 and 85 can be had quickly and easily from either end but preferably by removal of the guide plug 37.

The structure will thus be seen to be particularly well adapted to carry out the objects of the invention.

I claim:

1. A portable hand pump for liquids comprising a fluid inlet section, a fluid delivery section, inner and outer hollow longitudinal axially aligned cylinders telescoping at their inner ends, said cylinders being respectively connected at their outer ends to said sections, the inner end of said outer cylinder having a guide thereon in engagement with said inner cylinder, the inner end of said inner cylinder having a guide plug with outer portions in engagement with the outer cylinder, an inlet valve movable to open position for fluid inlet to one of said cylinders, an outlet valve movable to open position for fluid delivery from the other of said cylinders, and an imperforate tubular member in said inner cylinder in engagement at one end in the fluid delivery section and at the other end in said guide plug, the interior of said tubular member providing a fluid passageway and the space 'between said tubular member and said inner cylinder being isolated from air and liquid access.

2. A portable hand pump as defined in claim 1 in which said tubular member has plates thereon spaced inwardly from each end, and resilient members are interposed between said plates and facing portions of said fluid delivery section and said guide plug.

3. A portable hand pump as defined in claim 1 in which said tubular member has resilient packing members at each end thereof in engagement with said fluid delivery section and said guide plug.

- 4. A portable hand pump for liquids comprising a fluid inlet section having an inlet valve seat, a fluid delivery section having a delivery valve seat, inner and outer hollow longitudinal axially aligned cylinders telescoping at their inner ends, said cylinders being respectively connected at their outer ends to said sections, the inner end of said outer cylinder having a guide thereon in engagement with said inner cylinder, the inner end of said inner cylinder having a guide plug with outer portions in engagement with said outer cylinder. an inlet valve assembly in said inlet section at the outer end of one of said cylinders having a holding ring retained by said cylinder end and having a valve plug for engagement with said inlet valve seat and movable to open position for fluid inlet, said inlet section and said cylinder end being separable for insertion and removal of said inlet valve assembly, a delivery valve in said delivery section at the outer end of the other of said cylinders and movable to open position for fluid delivery, a closure member in said delivery section engaging said delivery valve and removably retaining said delivery valve in position, said 5 6 delivery section having a bore communicating with the References Cited by the Examiner delivery valve seat, said guide plug having an interior UNITED STATES PATENTS passageway therethrough, a tubular member seated at 1,999,655 4/1935 Coyle 103-188 one end in said bore and at the other end in said passageway, plates mounted on said tubular member inwardly 5 2,649,335 8/1953 Funke 103178 of the ends thereof, and resilient members on said tubular member engaging said plates and said delivery section at MARK NEWMAN Examiner one end and said guide plug at the other end. WARREN E. COLEMAN, Examiner. 

1. A PORTABLE HAND PUMP FOR LIQUIDS COMPRISING A FLUID INLET SECTION, A FLUID DELIVERY SECTION, INNER AND OUTER HOLLOW LONGITUDINAL AXIALLY ALIGNED CYLINDERS TELESCOPING AT THEIR INNER ENDS, SAID CYLINDERS BEING RESPECTIVELY CONNECTED AT THEIR OUTER ENDS TO SAID SECTIONS, THE INNER END OF SAID OUTER CYLINDER HAVING A GUIDE THEREON IN ENGAGEMENT WITH SAID INNER CYLINDER, THE INNER END OF SAID INNER CYLINDER HAVING A GUIDE PLUG WITH OUTER PORTIONS IN ENGAGEMENT WITH THE OUTER CYLINDER, AN INLET VALVE MOVABLE TO OPEN POSITION FOR FLUID INLET TO ONE OF SAID CYLINDERS, AN OUTLET VALVE MOVABLE TO OPEN POSITION FOR FLUID DELIVERY FROM THE OTHER OF SAID CYLINDERS, AND AN IMPERFORATE TUBULAR MEMBER IN SAID INNER CYLINDER IN ENGAGEMENT AT ONE END IN THE FLUID DELIVERY SECTION AND AT THE OTHER END IN SAID GUIDE PLUG, THE INTERIOR OF SAID TUBULAR MEMBER PROVIDING A FLUID PASSAGEWAY AND THE SPACE BETWEEN SAID TUBULAR MEMBER AND SAID INNER CYLINDER BEING ISOLATED FROM AIR AND LIQUID ACCESS. 